Corn stover

Soil tolerance

2.02

Khanna and Dhungana (2007)

Corn stover

2.4

Edwards (2007)

Corn stover

2000–2005 mean yields for Wisconsin

2.31–3

Vadas et al. (2008)

Switchgrass

Iowa, Illinois field trials

2.58

Khanna and Dhungana (2007)

Switchgrass

4

Duffy (2007)

Switchgrass

Farm-scale (northern South Dakota to southern Nebraska)

2.23 (5-year average) (Range, 1.7–2.7)

Perrin et al. (2008)

3.12 (10-year average) (Range, 2.6–3.5)

Switchgrass

3.8

Khanna et al. (2008)

19.74 (10-year PV)

Switchgrass

Nitrogen level

4–5.8

Vadas et al. (2008)

Switchgrass

Research blocks

7.14 (average)

Lewandowski et al. (2003)

9.8 (best)

Switchgrass

3.6–8.9 (previous)

Shinners et al. (2006)

Plot trials

2.3–4 (own)

Switchgrass

Plot trials

6.33

Fike et al. (2006)

4.64–8.5

Switchgrass

Field trials

Berdahl et al. (2005)

Mean

1.12–4.1

Strains:

Dacotah

1.11–4.22

ND3743

0.91–3.92

Summer

1.18–4.38

Sunburst

1.43–5.57

Trailblazer

1.15–4.88

Shawnee

1.06–4.5

OK NU-2

0.89–4.18

Cave-in-Rock

0.97–4.27

Switchgrass

Plot trials

Vogel et al. (2002)

Iowa

5.2–5.6

Nebraska

4.7–5